MOISTURE MECHANISM THAT CAUSES ASPHALT STRIPPING IN ASPHALTIC PAVEMENT MIXTURES

A LABORATORY TEST METHOD FOR STRIPPING PREDICTION (ASPHALT-AGGREGATE DEBONDING) IS SATURATED ASPHALT CONCRETE MIXTURES IS SHOWN. FOUR-INCH DIAMETER FIELD CORES OR LABORATORY SPECIMENS ARE USED. SPLIT CYLINDER TEST RESULTS (TENSILE STRENGTHS) ON PAIR-GROUPS OF SPECIMENS, IN WHICH SOME SPECIMENS FROM THE SAME GROUP ARE THERMAL CYCLED IN A SATURATED CONDITION (TO DUPLICATE FIELD STRIPPING CONDITIONS) AND OTHERS ARE MAINTAINED IN A DRY STATE BEFORE TESTING ARE EVALUATED. THE DEVELOPMENT OF AN OPTIMUM SET OF SPLIT CYLINDER TEST CONDITIONS ARE INCLUDED: RATE OF DEFORMATION AND TEMPERATURE, "TENSILE STRENGTH RATIO," TSR, WAS USED TO QUANTIFY THE AMOUNT OF STRIPPING AND TO RANK MISTURES. ANTI-STRIPPING REMEDIES SUCH AS ADDITION OF LIME, USE OF HYDRATED LIME COATED AGGREGATES, ADDITION OF CATIONIC ASPHALT ADDITIVE, AND DECREASE IN VOIDS WERE EVALUATED USING TSR FOR A PROMINENT STRIPPING MIXTURE IN SOUTHEASTERN IDAHO CONTAINING INKOM AREA AGGREGATES. FIELD CORES FROM ACTUAL PAVEMENT PROJECTS IN 1970 WERE ALSO TESTED AND RANKED BY THE TSR METHOD FOR STRIPPING DAMAGE PREDICTION. THE FIRST WORK WAS SUMMARIZED, INCLUDING FATIGUE TESTS ON SATURATED LABORATORY SPECIMENS, STATIC TESTS UNDER FREE WATER AND HIGH HUMIDITY CONDITIONS, SUPPLEMENTARY TESTS TO DETERMINE INTERNAL PRESSURES FROM TEMPERATURE CHANGE, AND AN APPROACH TO PRESSURE-FORCE RELATIONSHIPS FOR ADHESION BREAKDOWN. /AUTHOR/

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Filing Info

  • Accession Number: 00210458
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: R-47
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Aug 8 1971 12:00AM